Where to find the undo list?
Try CtrlAltZ. That wiki page is for Blender 2.4x.

Here's the 2.6x page (which is current for 2.7x, as there is no 2.7x wiki yet)

If you want to access it from a menu, it's in 3D view > Header > Object:



If you want to access it from a toolbar, it's in 3D view > Toolshelf (T) > Tool > History: